EntityEventDispatcher.java

/*
 * Copyright 2010 Impetus Infotech.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.impetus.kundera.ejb.event;

import java.util.List;

import javax.persistence.PersistenceException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.impetus.kundera.ejb.EntityManagerImpl;
import com.impetus.kundera.metadata.EntityMetadata;

/**
 * The Class EntityEventDispatcher.
 */
public class EntityEventDispatcher {

	/** The Constant log. */
	private static final Log log = LogFactory.getLog(EntityManagerImpl.class);

	/**
	 * Fire event listeners.
	 * 
	 * @param metadata
	 *            the metadata
	 * @param entity
	 *            the entity
	 * @param event
	 *            the event
	 * @throws PersistenceException
	 *             the persistence exception
	 */
	public void fireEventListeners(EntityMetadata metadata, Object entity,
			Class<?> event) throws PersistenceException {
		
		// handle external listeners first
		List<? extends CallbackMethod> callBackMethods = metadata
				.getCallbackMethods(event);
		
		if (null != callBackMethods && !callBackMethods.isEmpty()) {
			log.debug("Callback >> " + event.getSimpleName() + " on "
					+ metadata.getEntityClazz().getName());
			for (CallbackMethod callback : callBackMethods) {
				log.debug("Firing >> " + callback);
				try {
					callback.invoke(entity);
				} catch (Exception e) {
					throw new PersistenceException(e);
				}
			}
		}
	}
}